Sony Xperia E1 is the entry level Android Smartphone, which runs on Android 4.3 Jelly Bean firmware. Sony has recently rolled out the Android 4.4.2 Kitkat update for Xperia E1 SS D2005, D2004. So if you own this device and facing issues updating it to Android 4.4.2 Kitkat, then follow this guide and manually update Xperia E1 SS D2005, D2004 to Android 4.4.2 Kitkat firmware. This update can be installed on both locked and unlocked bootloader and installing this update un-roots your device.